For best results, use yellow or sweet onions. Avoid red onions, as their flavor is not as well-suited to caramelization. The cooking time may vary depending on your slow cooker. Check the onions after 8 hours and adjust the cooking time as needed. Caramelized onions can be stored in an airtight container in the refrigerator for up to 5 days, or frozen for up to 3 months. Portion them into ice cube trays for easy use in small quantities.
Slow Cooker Caramelized Onions
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PREP TIME10 mins
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COOK TIME10 hrs
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TOTAL TIME10 hrs 10 mins
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SERVING16 People
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VIEWS100
Transform ordinary onions into a rich, deeply flavored delicacy with minimal effort! This slow cooker method yields perfectly caramelized onions, ready to elevate everything from gourmet burgers to elegant tarts. Prepare to be amazed by the sweet, savory depth.
Ingridients
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Nutrition
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Carbohydrate11 g
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Cholesterol8 mg
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Fiber2 g
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Protein1 g
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Saturated Fat2 g
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Sodium170 mg
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Sugar5 g
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Fat3 g
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Unsaturated Fat0 g
DIRECTIONS
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01 Step
Recipe View 2 mins Grease the slow cooker: Use half of the melted butter to thoroughly coat the bottom and sides of your slow cooker. This prevents sticking and promotes even caramelization. (2 minutes)
02 Step
Recipe View 5 mins Combine onions, salt, and butter: In a large bowl, gently toss the thinly sliced onions with the remaining melted butter and salt, ensuring that the onions are evenly coated. (5 minutes)
03 Step
Recipe View 10 hrs Slow cook to perfection: Transfer the buttered onions to the prepared slow cooker. Spread them in an even layer. Cover and cook on LOW for approximately 10 hours, or until the onions are deeply browned, softened, and intensely sweet. Stir once or twice during cooking if possible. (10 hours)
04 Step
Recipe View 1 hrs Finishing touches (optional): For an even richer flavor, during the last hour of cooking, you can add a tablespoon of balsamic vinegar or a teaspoon of brown sugar. Stir well to combine. (1 hour)
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Austyn Smitham
Apr 30, 2025This recipe is a game-changer! I always struggled to caramelize onions on the stovetop, but the slow cooker makes it foolproof.
Bailey Morissette
Apr 15, 2025I was skeptical, but these were the best caramelized onions I've ever made! So easy and delicious.
Sheridan Toy
Feb 17, 2025Freezing them in ice cube trays is genius! I add them to everything now.